Onsize问题

切分窗口后用onsize控制比例 可出现问题 不知道怎么回事
MFCSDI.exe 中的 0x782b8375 (mfc80d.dll) 处未处理的异常: 0xC0000005: 写入位置 0x00000004 时发生访问冲突       
在线等呀  BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
// TODO: 在此添加专用代码和/或调用基类
CRect rect;
GetClientRect(&rect);
m_wndSplitter.CreateStatic(this,   2,  2 );  
m_wndSplitter.CreateView(0,   0,   RUNTIME_CLASS(CshowView1),   CSize(rect.Width()/2,rect.Height()/2),   pContext);
m_wndSplitter.CreateView(0,   1,   RUNTIME_CLASS(CshowView2),   CSize(rect.Width()/2,rect.Height()/2),   pContext);
m_wndSplitter.CreateView(1,   0,   RUNTIME_CLASS(CMshowView3),   CSize(rect.Width()/2,rect.Height()/2),   pContext);
m_wndSplitter.CreateView(1,   1,   RUNTIME_CLASS(CshowView4),   CSize(rect.Width()/2,rect.Height()/2),   pContext);
m_bSplitterCreated=TRUE;
    return  TRUE;
 
}void CMainFrame::OnSize(UINT nType, int cx, int cy)
{
CFrameWnd::OnSize(nType, cx, cy);
CRect rect1; GetClientRect(&rect1); if (m_bSplitterCreated) {
               m_wndSplitter.SetRowInfo(0,rect1.Height()/2,10);（出错）
               m_wndSplitter.SetRowInfo(1,rect1.Height()/2,0);
m_wndSplitter.SetColumnInfo(0,rect1.Width()/2,0);
m_wndSplitter.SetColumnInfo(1,rect1.Width()/2,0);   }
                  m_wndSplitter.RecalcLayout();
}